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Finding the Fourth Proportional to 3,078.66, 4,617.99 and 770.16

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Solution

The fourth proportional to 3,078.66, 4,617.99 and 770.16 is: 1,155.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.66 : 4,617.99 = 770.16 : x
  2. Step 2: Convert to fraction form
    3,078.66/4,617.99 = 770.16/x
  3. Step 3: Cross multiply
    3,078.66x = 4,617.99 × 770.16
  4. Step 4: Simplify right side
    3,078.66x = 3,556,591.18
  5. Step 5: Solve for x
    x = 3,556,591.18/3,078.66
  6. Step 6: Final answer
    x = 1,155.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.